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/*
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 * Copyright (c) 2012 Nicolas George
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public License
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 * as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
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 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include
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#include "libavutil/avstring.h"
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#include "libavutil/base64.h"
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#include "url.h"
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typedef struct {
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    const uint8_t *data;
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    void *tofree;
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    size_t size;
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    size_t pos;
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} DataContext;
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static av_cold int data_open(URLContext *h, const char *uri, int flags)
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{
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    DataContext *dc = h->priv_data;
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    const char *data, *opt, *next;
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    char *ddata;
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    int ret, base64 = 0;
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    size_t in_size;
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    /* data:content/type[;base64],payload */
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    av_strstart(uri, "data:", &uri);
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    data = strchr(uri, ',');
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    if (!data) {
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        av_log(h, AV_LOG_ERROR, "No ',' delimiter in URI\n");
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        return AVERROR(EINVAL);
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    }
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    opt = uri;
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    while (opt < data) {
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        next = av_x_if_null(memchr(opt, ';', data - opt), data);
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        if (opt == uri) {
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            if (!memchr(opt, '/', next - opt)) { /* basic validity check */
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                av_log(h, AV_LOG_ERROR, "Invalid content-type '%.*s'\n",
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                       (int)(next - opt), opt);
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                return AVERROR(EINVAL);
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            }
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            av_log(h, AV_LOG_VERBOSE, "Content-type: %.*s\n",
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                   (int)(next - opt), opt);
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        } else {
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            if (!av_strncasecmp(opt, "base64", next - opt)) {
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                base64 = 1;
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            } else {
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                av_log(h, AV_LOG_VERBOSE, "Ignoring option '%.*s'\n",
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                       (int)(next - opt), opt);
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            }
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        }
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        opt = next + 1;
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    }
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    data++;
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    in_size = strlen(data);
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    if (base64) {
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        size_t out_size = 3 * (in_size / 4) + 1;
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        if (out_size > INT_MAX || !(ddata = av_malloc(out_size)))
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            return AVERROR(ENOMEM);
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        if ((ret = av_base64_decode(ddata, data, out_size)) < 0) {
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            av_free(ddata);
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            av_log(h, AV_LOG_ERROR, "Invalid base64 in URI\n");
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            return ret;
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        }
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        dc->data = dc->tofree = ddata;
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        dc->size = ret;
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    } else {
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        dc->data = data;
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        dc->size = in_size;
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    }
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    return 0;
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}
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static av_cold int data_close(URLContext *h)
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{
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    DataContext *dc = h->priv_data;
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    av_freep(&dc->tofree);
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    return 0;
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}
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static int data_read(URLContext *h, unsigned char *buf, int size)
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{
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    DataContext *dc = h->priv_data;
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    if (dc->pos >= dc->size)
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        return AVERROR_EOF;
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    size = FFMIN(size, dc->size - dc->pos);
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    memcpy(buf, dc->data + dc->pos, size);
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    dc->pos += size;
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    return size;
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}
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URLProtocol ff_data_protocol = {
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    .name           = "data",
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    .url_open       = data_open,
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    .url_close      = data_close,
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    .url_read       = data_read,
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    .priv_data_size = sizeof(DataContext),
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};